Special warning lights will be installed on runways at Denver International Airport and 19 other major U.S. airports to reduce the potential for “runway incursions,” federal aviation officials said Monday.

When two planes, or a plane and a ground vehicle, are in danger of colliding on a runway, officials call it an incursion. The Federal Aviation Administration has been running tests of Runway Status Lights at Dallas-Fort Worth International and San Diego International airports, FAA Administrator Robert Sturgell said.

A United Airlines pilot admits he stood naked in the window of his 10th-floor room at the Westin Hotel at Denver International Airport, but says he had no idea he was visible to anyone inside the main terminal -- and he's horrified to now face a criminal charge of indecent exposure.

A 27-year-old man has been arrested for investigation of first-degree murder after he allegedly demanded money from an elderly disabled man near a Denver homeless shelter and then beat and strangled the man to death.